Add missing amount operations

1 files changed, 9 insertions, 0 deletions

diff --git a/test.py b/test.py
index 1965521..c496e11 100644
--- a/test.py
+++ b/test.py
@@ -220,6 +220,8 @@ class AmountTest(WebMockTestCase):
         amount4 = portfolio.Amount("ETH", 0.0)
         self.assertEqual(amount1, amount1 + amount4)
 
+        self.assertEqual(amount1, amount1 + 0)
+
     def test__radd(self):
         amount = portfolio.Amount("XVG", "12.9")
 
@@ -241,6 +243,13 @@ class AmountTest(WebMockTestCase):
         amount4 = portfolio.Amount("ETH", 0.0)
         self.assertEqual(amount1, amount1 - amount4)
 
+    def test__rsub(self):
+        amount = portfolio.Amount("ETH", "1.6")
+        with self.assertRaises(Exception):
+            3 - amount
+
+        self.assertEqual(portfolio.Amount("ETH", "-1.6"), -amount)
+
     def test__mul(self):
         amount = portfolio.Amount("XEM", 11)